710 in Gmatprep but 540 on GMAT day-OCT 21st 2011

I agree with you. I can't be guessing the last 10. I will work on this difficiency.

Posted from my mobile device

Hi dude. I must thank you for critically thinking on where could have I gone wrong and advising me your opinion.
First let's assume your logic about A.P. and algorithm about questions guessed.
If this is true, then why do they give GMATprep n powerprep with different algorithms.
I did the same in mgmat tests. Why would mgmat present their tests with different algo?
My friend, who gave exam in aug who scored 600 then n 540 on my exam day got 24 in verbal
She had scored 34 in august. She followed the same strategy as mine. She did guess from 32 to 41 questions but still she could score 34.
In these two months, I know how much she improved. Nothing has got reflected in the test.
Last one, I got 46 in quant when I started my prep. I did not all the quant formulae. I forgot all formulae after studying them in 12th n after studying for campus placements. When I got 46 at my start of prep, I could not finish quant I had to guess the last 4 questions.
I did solve very good tough quant questions with ease. FYI quant also had data 3 interpretation questions. I solved them with ease too.I was expecting 50 or 49.

My questions about whether a day can have any effects on score are still unanswered.
I ask this again and again because everyone who we knew who took exam on Oct 21st got 150 or more points less

Posted from my mobile device

GMAC is shady. I know someone who did >100 worse from an actual GMAT to another later actual GMAT, with more study....
They've had bugs in grading before and they're still completely opaque so who knows what it's doing with your answers. Extra shady if they're a for-profit organization.

Dude,
I did not completely understand what you meant to say.

Hi,
Thanks for your analysis on my test.
I dont know whether i have misread your post or not. But I want to clarify that I did finish off my test. I left no question unanswered.
My Questions are-
How is it treated answering questions in a row same option as same as leaving questions unasnwered?
It could happen that I read all last three and thought answer should be 'D' in a row. I may be wrong for any question. But does the program think I guessed and treat those questions as unanswered ones?
It's hard to believe and accept this as true mate.

However, I still feel spending equal time on all questions and managing time properly is great strategy. I will work upon it.

Also do you think any particular day can have its effect on scores? If majority of top scorers give exam on same day?

Abhishek,
Where and when did you give your exam? Are you by any chance the same abhishek who gave in Pune on Oct 21st? I could not talk to that abhishek after my exam as he left early and forgot his jacket in my locker

Well nobody knows precisely how the algorithm works, I was just giving a possible guess as to why your would score so low. Also seven questions is a good chunk of the verbal, and after each subsequent incorrect answer, the test gives an easier question. So the last few questions you answered D on were likely low level questions and could have caused a large drop in your score.

As far as a particular day having an effect on your test - no I don't think so. The reason being that your scores are given as a percentile compared to the last 3 years of test takers, so you aren't only being compared to those who sit for the test the same day as you. BUT the day surely can have an effect on you - if you are tired, nervous etc, you may perform more poorly than you would in a different setting. So in that regard your scores will probably fluctuate from day to day.